We went out the weekend before the 4th at Ray Roberts State Park just north of Dallas. It was a hot weekend and on Saturday it got close to 100F by late afternoon. Our site had no shade. Our 2008 Classic 25FB had all the awnings deployed. The 13.5 btu AC was able to keep us cool enough. 80 to 83 feels cool at 5pm when its 100f outside. Luckily the humidity was down during this heat. We kept the AC on manual so the fan would run when the compressor cycled off which was less and less as the day got hotter and hotter. We kept the transparent window shades down in the dinette area so we could see out. The front bedroom shades including the black out shades were down and the curtains drawn. We didn't cover the Fantasitic Fan vents and we closed the two roof skylight shades. It was comfortable in the front bedroom to take a nap or read during the hotest part of the day as long as the AC fan was still blowing. The rear dinette area was comfortable enough to watch TV also.

Having said this if I ever need to replace the AC I will go with a 15k.

How do the Maxair vent covers help with the heat? Are they dark or something? I put reflective bubble material over the inside opening of mine using tiny spots of industrial velcro in the corners, but I can think that keeping the sun off the outside of the vent would help even more.

There are some who have experimented with putting water misters on the roof. This would work really good in dry climates.

Perry

Residential window units are designed to collect the condensed water in a tray and the condenser fan is designed to sling this water into the condenser fins which aids the efficiency of the system. The excess water is allowed to drain out the end of the housing. Since the condensate does not contain minerals, it doesn't clog mister jets and deposit a residue. I've wondered why RV rooftop A/C units don't take advantage of this and have assumed it is a design compromise to keep the profile low using squirrel cage blowers. An inventive soul who designs a reliable way to move the condensate to the condenser fins may find a pot of gold at the end of this rainbow.

Residential window units are designed to collect the condensed water in a tray and the condenser fan is designed to sling this water into the condenser fins which aids the efficiency of the system. The excess water is allowed to drain out the end of the housing. Since the condensate does not contain minerals, it doesn't clog mister jets and deposit a residue. I've wondered why RV rooftop A/C units don't take advantage of this and have assumed it is a design compromise to keep the profile low using squirrel cage blowers. An inventive soul who designs a reliable way to move the condensate to the condenser fins may find a pot of gold at the end of this rainbow.